High-frequency electrical conductor.



HIGH-FREQUENCY ELECTRICAL CONDUCTOR.

rassegna Specification of Letters Patent. Application filed January 7, 1911.

Patented-Oct. 1, 1912. Serial No. 601,380.

,To ali whom i may concern.'

Be it known that I, REGINALD A. FnssEN- una, a citizen of the United States, residing at Brant Rock, in the State of Massachusctts, have invented certain new and useful Improvements in High-Frequency Electrical Conductors, of which the following is a speciiication.

My invention relates to electrical apparatus for dealing with high frequency currents, more particularly to the construction of conductors such as the coils employed in wireless telegraph apparatus. Its primary object is to produce amore eliicient form of coil or other conductor, and especially to construct a coil having a large amount of selfinduction per unit of resistance.

I have illustrated the' invention in several forms in the accompanying drawings, wherein- Figure lis a a conductor" for making coils and F ig. 2 is a cross-section of the same; l? ig. 3 is a side elevation of another forni of conductor and Fig. l is a cross-section of it, while Fig. 5 is a partial longitudinal section of a coil made by winding the conductor edgewise.

In order to produce a large amount of selfinduction per unit of resistance, I make the conductor out of a number of elements grouped together so as to take the general form of a iiat strip, c'. e., the width of the conductor is greater than its thickness. For instance, in Eig. 2, the width may be oneeigli of an inch while the thickness is one- 'i y-iourtln from which it will be seen that here use small wire. These wires forming the individual elements are preferably coated with insulation such as enamel and the conductor itself should be made in spiral or woven form, so lthat within certain lengt-h of the conductor every individual elemental wire will successively occupy every position around the circumference of a conductor. Such a conductor is then wound edgewise to torni a coil, as' indicated in rlig. i, the conductor is Inade'by assembling the wires in the form of a hollow twisted tube and the tube is then flattened have sectional shape as indicated lig. 2. In Fig. 3, I show a form in which side elevation of a portion ofthe Awires are first braided in tubular form after the fashion of a tubular lamp wick and the braided tube is then flattened in the form of Fig. 4.

Of course the strip or conductor may be more than two wires thick and may have any number of layers of wire; and moreover each of the wires described may itself consist of a number of smaller wires laid together with a circular twist as indicated ll, in Figs. l and 2. In such case these ultimate subdivisions are themselves preferably insulated as by enamel, and this latter construction I have found especially adapted in making large conductors, such as a conductor l thick and two inches wide. Such a conductor may be made by rst construct-ing the composite wire say of 500 elements in sulated and laid together with a circular twist and then this conductor put ltogether as indicated in the drawings. I lind such construction gives better results than inaking the flat conductors out of a great number of layers.

By thus forming a large number of wires in the shape of af flat strip or conductor and then winding such flat conductor edgewise into a coil, I obtain a much larger inductance for a given resistance than has been made with any other form of conductor, and

I thereby obtain higher etliciency in apparatus for generating and utilizing high frequency currents` This advantage is especially marked in dealing with electrical oscillations in wireless telegraphy.

Having thus described my invention and illustrated its use, what I claim is the following:

l. A coil for high frequency currents formed of a strip conductor wound edgewise. said strip conductor being formed of a number of wires and the position of said wires in the strip being varied with the length of the strip.

2. A coil for high frequency currents formed of a strip conductor wound edgewise, said strip conductor being formed of a number of wires and the position ci said wires in the strip being uniformly varied with the length of' the strip,

3. A coil for high frequency currents formed of a strip conductor wound edgewise, said strip conductor being formed of e number of Wires and the position of seid wires in the strip being varied in spiral fashion with the length of the strip.

4. A coily for high frequency currents formed of a strip conductor Wound edge- Wise, said strip conductor being formed of a number of Wires and the position of said Wires in the strip being varied in spiral fashion and in opposite senses With the length of the strip.

5. A coil for high frequency currents formed of a strip. conduct-or Wound edge- Wise, seid strip conductor being formed of e, number of Wires and the position of said Wires in the strip being Varied in spiral fashion and in opposite senses, With the length of the strip, andiplaited. d A coil for high frequency currents formed of e strip lconductor wound edge- Wise, seid strip conductor being formed of s number of mein- Wires, each of seid main wires being formed of a number of smaller or sub-Wires, the position of saidlrnain Wires in the strip being varied with the length of the strip and the position of'said sub-Wires in seid main Wire being vnried with the length of the mein Wire.

7. Av coil for high frequency currents formed of a strip conductor Wound edge- Wise,A said strip conductor being formed of a number of main Wires, each of said main Wires being formed of a number of smaller or. sub-Wires, the position of said main Wires in the strip being uniformly varied With the length of the strip and the position of seid sub-Wires in said main Wire varied Wit-h the length of the mein Wire.

in testimony whereof I have hereunto signed my name in the presence of the two subscribed Witnesses,

Y Jnssin E. Benn FLoRENoE M. LYON.

being uniformly 

